Read through the whole thread before posting - chances are good that your question has already been asked.

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Here's a bootloader: v4.0-bootloader-sansaclipplus-01.02.16-dual_boot - I'm not responsible if your Clip+ catches on fire, kicks your puppy, etc. This bootloader boots Rockbox by default - hold the left button while powering on to boot the stock firmware.

Current firmware builds can be found here: http://build.rockbox.org/data/rockbox-sansaclipplus.zip (This link is automatically updated whenever a new revision is released.)
Installation instructions: Make sure the battery is charged. The Clip+ has to be in MSC mode, not MTP/Auto. Unpack the bootloader and a firmware build to the root of the Clip+. That's all.

Even though the bootloader installation and rockbox itself are tested, there's always a risk of BRICKING your device PERMANENTLY. Some Sansa AMS (m200 v4, C200 v2, Clip v2) have no known method for recovery, so this risk will not go away, even in (if any) future stable releases.

There's no known user-friendly recovery method for the AMS Sansas, those of them who can be unbricked (not all of them can) need to be physically opened, and they can be potentially damaged in the process.

Installation of a bootloader may or may not permanently disable DRM support, even if you uninstall it (this might only be true if you change the Date/Time settings).

mkamsboot will reject OF files which were not tested by us. If you try to patch a newer firmware, it will refuse. Use an older firmware.